Boiling-Cooler Production Method and Boiling Cooler

Abstract

A boiling-cooler production method according to the present invention is a method for producing a boiling cooler including a boiler for vaporizing a refrigerant by transferring heat from a heat source and a condenser for condensing the vaporized refrigerant and returning the condensed refrigerant to the boiler, the method including forming the condenser; and forming the boiler. The forming the boiler includes forming a boiling surface portion on a surface that is opposite to a mounting surface onto which the heat source is mounted, and is in contact with the refrigerant. The forming the boiling surface portion includes forming a plurality of protrusions that are aligned to each other and whose widths gradually increase from bases to ends of the protrusions.

What is claimed is: 
     
         1 . A method for producing a boiling cooler including a boiler for vaporizing a refrigerant by transferring heat from a heat source and a condenser for condensing the vaporized refrigerant and returning the condensed refrigerant to the boiler, the method comprising:
 forming the condenser; and   forming the boiler, wherein   the forming the boiler includes forming a boiling surface portion on a surface that is opposite to a mounting surface onto which the heat source is mounted, and is in contact with the refrigerant, the mounting surface being a surface of a mount included by the boiler, and   the forming the boiling surface portion includes forming a plurality of protrusions whose widths gradually increase from bases to ends of the protrusions.   
     
     
         2 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the boiling surface portion includes at least partially forming the boiling surface portion by additive manufacturing using metal powder. 
     
     
         3 . The method for producing the boiling cooler according to  claim 2 , wherein the forming the boiling surface portion includes at least partially forming the boiling surface portion by powder bed fusion as the additive manufacturing. 
     
     
         4 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the plurality of protrusions includes forming the plurality of protrusions to be aligned to each other in a matrix shape in first and second directions substantially perpendicular to each other in a plane substantially parallel to the boiling surface portion. 
     
     
         5 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the plurality of protrusions includes forming the plurality of protrusions to be aligned to each other in a staggered arrangement. 
     
     
         6 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the plurality of protrusions includes forming a plurality of linear protrusions that extend in a first direction in a plane substantially parallel to the boiling surface portion and aligned to each other in a second direction substantially perpendicular to the first direction in the plane substantially parallel to the boiling surface portion, and forming the plurality of protrusions that are aligned to each other on the linear protrusions and parts between the plurality of linear protrusions in the second direction. 
     
     
         7 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the plurality of protrusions includes forming the plurality of protrusions aligned at a pitch smaller than the width of each protrusion away from each other. 
     
     
         8 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the boiling surface portion includes forming the boiling surface portion without blasting after additive manufacturing. 
     
     
         9 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the boiling surface portion includes forming the boiling surface portion with blasting after additive manufacturing. 
     
     
         10 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the plurality of protrusions includes forming the plurality of protrusions into prismoid-shaped protrusions to be aligned to each other. 
     
     
         11 . The method for producing the boiling cooler according to  claim 1 , wherein a distance between the ends of the protrusions adjacent to each other is smaller than the width of the end of one of the protrusions, and a distance between the bases of the protrusions adjacent to each other is greater than the width of the end of one of the protrusions. 
     
     
         12 . The method for producing the boiling cooler according to  claim 1 , wherein the forming the boiling surface portion includes joining the condenser and the mount by welding, brazing, or screwing. 
     
     
         13 . A boiling cooler comprising:
 a boiler for vaporizing a refrigerant by transferring heat from a heat source; and   a condenser for condensing the vaporized refrigerant and returning the condensed refrigerant to the boiler, wherein   the boiler includes a mount, the mount including:
 a mounting surface onto which the heat source is mounted; and 
 a boiling surface portion formed on a surface opposite to the mounting surface and is in contact with the refrigerant, and 
   the boiling surface portion includes a plurality of protrusions whose widths gradually increase from bases to ends of the protrusions.   
     
     
         14 . The boiling cooler according to  claim 13 , wherein the plurality of protrusions are aligned in a matrix shape in the boiling surface portion in first and second directions substantially perpendicular to each other in a plane substantially parallel to the boiling surface portion. 
     
     
         15 . The boiling cooler according to  claim 13 , wherein the plurality of protrusions are aligned to each other in a staggered arrangement. 
     
     
         16 . The boiling cooler according to  claim 13 , wherein the boiling surface portion includes a plurality of linear protrusions that extend in a first direction in the plane substantially parallel to the boiling surface portion and aligned to each other in a second direction substantially perpendicular to the first direction in the plane substantially parallel to the boiling surface portion, and the plurality of protrusions that are aligned to each other on the linear protrusions and parts between the plurality of linear protrusions in the second direction. 
     
     
         17 . The boiling cooler according to  claim 13 , wherein the plurality of protrusions are aligned at a pitch smaller than the width of each protrusion away from each other in the boiling surface portion. 
     
     
         18 . The boiling cooler according to  claim 13 , wherein the protrusions are prismoid-shaped protrusions. 
     
     
         19 . The boiling cooler according to  claim 13 , wherein a distance between the ends of the protrusions adjacent to each other is smaller than the width of the end of one of the protrusions, and a distance between the bases of the protrusions adjacent to each other is greater than the width of the end of one of the protrusions. 
     
     
         20 . The boiling cooler according to  claim 13 , wherein the condenser and the mount are joined by welding, brazing, or screwing.